/Engine/Source/Runtime/Slate/Public/Framework/MultiBox/MultiBoxBuilder.h
Constructor
FSlimHorizontalToolBarBuilder ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< const [FUICommandList](API\Runtime\Slate\Framework\Commands\FUICommandList) > InCommandList, [FMultiBoxCustomization](API\Runtime\Slate\Framework\MultiBox\FMultiBoxCustomization) InCustomization, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FExtender](API\Runtime\Slate\Framework\MultiBox\FExtender) > InExtender, const bool InForceSmallIcons )